Our project addresses the critical “Sanitation Gap” — the reality that while public toilets are being built worldwide, safe sewage treatment is often missing. Globally, nearly 80% of wastewater is released untreated, especially in developing regions where waste from public washrooms flows into unlined pits or poorly managed tanks. This causes soil and groundwater contamination, water wastage, public health risks, and contributes to an estimated $260 billion annual global economic loss.
To solve this, we developed a solar-powered, portable Sewage Treatment Plant (STP) designed for decentralized use in both rural and urban public washrooms. Our system treats the entire waste stream on-site and converts it into valuable resources. The treated water is safe for irrigation, flushing, and cleaning, reducing freshwater demand, while the solid waste is biologically processed into nutrient-rich, chemical-free organic manure for farms and nurseries.
Built through field visits, surveys, and technical validation, our model prioritizes low energy dependence, durability, and real-world usability. With off-grid solar power, IoT-based monitoring, and a waste-to-resource approach, our solution transforms sanitation from an environmental liability into an economically viable, climate-resilient system for underserved communities.
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